Electbical snap-switch



H. 1. HOLDREDGE.

ELECTRICAL SNAP SWITCH.

APPLICATION FILED IUNE I2. 1920.

1,353,589. Pmntedse u 21,1920.

, HENRY JUDSON HOLDBEDGE, F WILKES-BARBIE, PENNSYLVANIA.

ELECTRICAL SNAP-SWITCH.

Specification of Letters Patent. Pate t d S t 21 1920 Application filed June 12, 1920. Serial No. 888,434.

To all whom it may concern:

Be it known that I, HENRY J UDSON H01,-

maroon, a citizen of the United States, residbeing had to the accompanying drawings.

This invention relates'to electrical snap switches and more particularly to that type of snap switch adapted to automatically disconnect current from the source of power.

An important object of the invention is to provide a switch of the above character whlch will automatically extinguish lights upon the closing or opening of a, door as desired.

A further object of the invention is to provide a device of the above character which is extremel simple in construction and o eration an which may be cheaply manu actured.

These and other objects I obtain by the combination and arrangement of the parts illustrated in the accompanying drawings,

'in which Figure 1 is a side elevation of a section of a door casing and door, showing my switch .ap lied thereto foruse.

ig. 2 is a plan view of my switch, portions being broken away for the purpose of illustration, and r Fig. 3 is an enlarged detail view showing the operating mechanism by means of which the snap switch is automatically operated by a door, window or other moving member.

Referring now more particularly to the drawings, in which like reference characters designate like parts throughout, m switch comprises a base 10 having mounte thereon a rotary snap switch 11 of the usual construction. The base 10 is provided with openings 12 by means of which the switch may beattached to a suitable support. A casing- 13 is provided through which the o crating stem of the snap switch extends, t e operating stem being provided exteriorly of the casing with an operating thumb piece 14. The swigch may likewise be rovided with the usu .on and off signs: s, if desired.

The operating stem 15of the switch has secured thereto, in an suitable manner, a cam 16, embodying diametrically opposed cam shoulders 17. A plate 18, or master plate, is rotatably mounted upon the stem ad acent the cam 16 and has pivotally mounted thereon a do 19. This dog embodies a shoulder 20 a apted to en age the cam shoulders 17 of the cam 16, an is held in firm engagement with the cam by means of a sprlng 21 which engages the dog upon the reduced extension 22 thereof, and the master plate 18 upon an integral hook shaped extension 23. The spring 21 is of the compression type andv constantly forces the shoulder 20 of the dog 19 into en agement with the cam 16. Binding 0% the shoulder 20 upon the cam 16 is prevented by means of the shoulder 19 formed onthe dog WlllCh engages against one side of the master plate 18. s

The master plate 18 is provided with an elongated slot 24 adapted to receive a pin 25 rlgidly mounted in a longitudinally shlftable bar 25. This bar is normally held in the position shown in the Figs. 2 and 3 by means of a tension spring 26 secured to the bar as at 27 and to the casing 13 as at 28. The ends of the bar are slidably mounted in suitable openings formed in the side walls of the casing 13 and one end of the bar is provided with a cushioning element 29' formed of rubber or the like.

In the application shown in Fig. 1, the switch is secured to the frame 20 of the door in such a manner that the cushioning element mounted on the bar 25 extends into the path of the door 31 when closing, as indicated by the dotted lines on this figure. It will be 0 vious that when. the,door is com.-

cam shoulder 17 of'the cam and shifts the 100 cam to the ositionshown by the dotted lines 1n Flg. 3. f, however, the lights have been pletely closed the bar 25 is shiftedlongitudinally causing, the master plate 29' toturned oif previous to the closing of the door and the cam is in the position indicated by the dotted lines in Fig.3, the dog 19 exercises no efiect whatever upon the cam, and the current remains turned ofi'. It will therefore be seen that if the current is turned on it will be disconnected through the snap switch upon closing of the door. This device may be applied to either ri ht hand or left hand opening doors by simply inverting the switch, and may be adapted for igniting the lights upon opening or closing the door by simply altering the position of the cam shoulders by shifting the cam throughBOi. upon the operating stem 15 of the switch.

-As many other changes of similar character and in the shape, size and arrange ment of the various parts herein shownmay be readily made, I do not limit myself to the particular construction hereinbefore 'set forth, but may make any such changes with ,out departing from the spirit'of the inven- 'tion or thescope of the subjoined claims,-

Having now described my invention, what I claim is: r

1. The combinationwith a rotary snap switch embodying the usual rotatable' operating stem-adapted when rotated to alternately placethe switch in open'and closed position and means for rotating-said stem, 9

of a cam secured'to said operating stem and embodying a shoulder, a longitudii'iallj shiftable 'bar arranged adjacent said cam,"

yieldab'le means normally holding-said bar, in one'posit-ion, and operating :means connected with said shiftable bar to beshifted theretVand-adapted to engage theshoulder of-sa'i cam to'shift' the cam in on'e'direction T when'j-theswitch is in one position and'inoperative to engage said shoulder-when the switch is' imthe other positibnz' *2. The"eombination with a rotarysnap' switch embodying the usual rotary operat ingfstem ada ted when rotated to alterv nately' placeft e switch in open and closed position and means for rotating said stem, of a cam secured to said operating stemand v embodyin a shoulder, a longitudinally shiftable ar arranged adjacent-saideam,

ieldablemeans normally holding said 'bar in one position, a plate rotatably mounted u n said 0 crating by when the bar is sh;ifted,and 'means carof said cam and shiftin the same when the plate is oscillated W en the switch in one-position and inoperative to engage said shoulder when the switch is in the other position. i j I 3. The combination with a rota snap switch embodying the usual rotatab e stem adapted when rotated to alternately place the switch in open and closed positron-and means for rotatingsaid stem, of a cam se-' cured to said operating stem and embodying a shoulder, a longitudinally shiftabl'e bar arranged adjacent said cam, yieldab'l'e means normally holding said bar in one position, a plate rotatably mounted upon said-stem ad acent said member, a pivoted dog carstem and connected with said shi table bar to be oscillated there connecting saidplate and said her whereby 'said plate is oscillated when the bar is shifted, said dog being operative to engage the shouldcr of said cam when the switch is i LOIIe position and inoperative to engage said shoulder when the switch is in the other position. a

4. The combination with a rotary snap switch embodyingithe usualrot'ary operating 'stem adapted :when rotated to; alternately place t e switch in open andclosed position 'and means for rotating said stein, of-a'cam secured to said operating stem and embodying a pair of. diametricallyopposed cam'shouldersfsaid shoulders-being disposed at an'angle of'QOPto the contact, blades of I the switch, a longitudinally shiitable bar arranged adjacent said ca'mt, yieldablemeans normally holding-said 'bar inone position, a pla-te rotatably mountedupon said-stem adjacent said cam and embodying a slot, a pin mounted upo'n said bar' and engaging in said 'slot and a pivoted springpressed dog carried by said-plate and engaging said cam, said shoulder being -rpositioned to be engaged by said dog when the switch is in one positionuandrbeing- 50 positionedas i to be free. from? engagement by said dog when the switch is in :the? other, position; J

'5': The: combinationziwith i a rotary, snap switch embodying the usual contact blades.

and rotatable operating f stem 5 therefor, o f a member secured to .said stem ,embodying .a pair of diametricallyrlopposed cam shoul ders, said shoulders being disposed-gatan angle of 90 degrees to the contact blades of the: switch, a longitudinally shiftable .bar arranged adjacent said member eldable means nonnally-"holdin said bar. in one positionyza plate rotata ly mounted upon said stem adjacent said member and-provided with a, slot,;-a pin :mounted. upon said bar and enga 'n said slot, a pivoted dog1 carried-bysai p ate, aspringmoving sai dog towardsaid cam and-a shoulder formed on said do'g. and enga ing said .plate to limit the movement of sai dog toward said cam. 6. The combination WllTrll a rotary snap switch embodying the usual contact elements, in. rotatablewoperatilig stem whereby said contact-elements; may be shifted into open andclosed positions-and means for rotating'saidbperating stem, of: additional means fon rotating 1 said operating stem, said means beingoperative when the switch elements are in one position and inoperative when the switch elementsare in the other position."

In testimony whereof I'hereunto afiix my signature.

I .HENRY JUDSO-N HOLDREDGE. 

